In this simulator the speed of propagation of a mechanical wave in media of different densities is studied. The media are: air, water, industrial oil, aluminum and copper. For the development of this practice, it is necessary to identify which are the means in which the waves propagate faster and slower, respectively. For the development of this practice, the student has a drum, a drumstick, a metal hammer, a tank, an aluminum bar, an iron bar, a stopwatch and a sensor.